The processes of metallic asperities moving across each other, which are decisive in most machinery, have been visualized at the atomic scale, revealing unexpected behaviour especially when under tensile stress.
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Schwarz, U.D. Visualized atom by atom. Nat. Mater. 21, 140–142 (2022). https://doi.org/10.1038/s41563-021-01115-y
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DOI: https://doi.org/10.1038/s41563-021-01115-y